Everything runs in your browser (WebAssembly): the file is never uploaded. A share link carries the file itself in the part after #, which browsers do not send to servers; anyone with the link can read it, so remove passwords first.
Loading mydumper-lint…
about 2 MB, once
The same check from a terminal:
Install with go install github.com/tomsihap/mydumper-lint/cmd/mydumper-lint@latest, or download a release. --fix applies the safe fixes, --diff shows them.